Disclosed is a method comprising: a) dispersing a first monomer mixture comprising least one least monomer, the first monomer mixture having a total glass transition temperature (Tg) in the range of from −10° C. to −50° C. with a surfactant and an initiator in an aqueous medium; b) when the first monomer mixture is at least 85% dispersed, adding a second monomer mixture comprising at least one monomer, the second monomer mixture having a Tg at least 20° C. greater than the Tg of the first monomer mixture, to the aqueous medium; and c) forming a polymer with the first and second monomer mixtures. Also disclosed is a pressure sensitive adhesive comprising the polymer formed by this method.